Robotics Worksheet: DC and Servo Motors

Robotics lesson 12: DC motors and servo motors · Set 534 · 40 questions

Robot tip (Spin or point): DC motor: spins continuously; swap its wires to reverse it. Servo: goes to a set angle between 0° and 180°. Servo turn = bigger angle − smaller angle (30° to 120° = 90°). A program like angle = 90, angle = angle + 30 adds and takes away degrees in order.

1. 1.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a buzzer (c) a light sensor (d) a DC motor
2. 2.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 45°. Where does the arm point? (a) points up and left (b) points left (c) points up and right (d) points straight up
3. 3.🦾 A servo moves from 180° to 150°. How many degrees does it turn?
4. 4.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
5. 5.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a buzzer (c) a servo motor (d) a fan
6. 6.True or false: “has just two wires” is true of a DC motor. (a) False (b) True
7. 7.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) False (b) True
8. 8.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 90°. Where does the arm point? (a) points straight up (b) points right (c) points up and right (d) points up and left
9. 9.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 0°. Where does the arm point? (a) points right (b) points left (c) points up and left (d) points up and right
10. 10.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
11. 11.⚙️ A motor changes electrical energy into … (a) movement (b) water (c) light (d) sound only
12. 12.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
13. 13.🦾 A servo moves from 40° to 60°. How many degrees does it turn?
14. 14.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
15. 15.🦾 A servo program runs:
    angle = 80
    angle = angle + 10
    angle = angle − 30
    angle = angle − 40
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
16. 16.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
17. 17.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
18. 18.True or false: “reverses if wires swap” is true of a DC motor. (a) True (b) False
19. 19.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 10° (c) 1800° (d) 180°
20. 20.True or false: “holds a set angle” is true of a servo motor. (a) False (b) True
21. 21.True or false: “has a signal wire” is true of a DC motor. (a) False (b) True
22. 22.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
23. 23.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
24. 24.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
25. 25.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
26. 26.🦾 A servo moves from 60° to 160°. How many degrees does it turn?
27. 27.True or false: “has just two wires” is true of a servo motor. (a) False (b) True
28. 28.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 180°. Where does the arm point? (a) points left (b) points up and left (c) points up and right (d) points straight up
29. 29.🦾 A servo moves from 160° to 60°. How many degrees does it turn?
30. 30.🦾 A servo moves from 160° to 70°. How many degrees does it turn?
31. 31.🦾 A servo program runs:
    angle = 90
    angle = angle − 60
    angle = angle − 30
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
32. 32.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) shake it (c) swap its two wires (d) add more wheels
33. 33.True or false: “reverses if wires swap” is true of a servo motor. (a) False (b) True
34. 34.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) True (b) False
35. 35.🦾 A servo program runs:
    angle = 150
    angle = angle − 50
    angle = angle + 60
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
36. 36.🦾 A servo program runs:
    angle = 10
    angle = angle − 10
    angle = angle + 40
    angle = angle + 60
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
37. 37.🦾 A servo moves from 20° to 130°. How many degrees does it turn?
38. 38.🦾 A servo program runs:
    angle = 80
    angle = angle + 10
    angle = angle − 50
    angle = angle + 50
    angle = angle − 10
    To what angle (in degrees) does the servo turn in the end?
39. 39.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
40. 40.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor

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